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SMS01GAF Datasheet(PDF) 37 Page - Numonyx B.V |
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SMS01GAF Datasheet(HTML) 37 Page - Numonyx B.V |
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37 / 61 page  SMSxxxAF, SMSxxxFF, SMSxxxBF Timings 37/61 6.1.5 Last Host Command, Next Host Command Timings The host can send a new command NCC clock cycles after sending the previous one as shown in Figure 21. Figure 21. Command Sequence (All Modes) 6.2 Data Read 6.2.1 Single Block Read The host selects one card for the data read operation by issuing CMD7, and sets the valid block length for oriented data transfer by issuing CMD16. Figure 22 shows the timings for a basing bus read operation. The sequence starts with a Single Block Read command (CMD17) which specifies the start address in the argument field. The response is sent on the CMD line. Data transmission from the card starts NAC after the end bit of the read command, where NAC is the access time. CRC check bits are appended to the data bits to allow the host to check for transmission errors. Figure 22. Single Block Read Command 6.2.2 Multiple Block Read In Multiple Block Read mode, the card responds to the read command from the host by sending a continuous flow of data blocks. The data flow is terminated by a STOP_TRANSMISSION command (CMD12). Figure 23 describes the Multiple Block Read command followed by the data blocks and Figure 24, the response to a STOP_TRANSMISSION command. The data transmission stops two clock cycles after the end bit of the STOP_TRANSMISSION command. S T CONTENT CRC E Z ****** Z S T Host Command Host Command NCC Cycles ai10049 CONTENT CRC E CMD S T CONTENT CRC E Z *** P S T Host Command Response NCR Cycles ai10050 CONTENT CRC E CMD Z P Z **** Z Z Z Z ZZ Z Z P ********** P S D *** D D NAC Cycles Read Data DAT |
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